From: Jan Kara <jack@suse.cz>
To: Ritesh Harjani <riteshh@linux.ibm.com>
Cc: jack@suse.cz, tytso@mit.edu, linux-ext4@vger.kernel.org,
adilger.kernel@dilger.ca, linux-fsdevel@vger.kernel.org,
darrick.wong@oracle.com, hch@infradead.org, cmaiolino@redhat.com
Subject: Re: [PATCHv3 1/6] ext4: Add IOMAP_F_MERGED for non-extent based mapping
Date: Wed, 26 Feb 2020 13:26:55 +0100 [thread overview]
Message-ID: <20200226122655.GM10728@quack2.suse.cz> (raw)
In-Reply-To: <25695b1a4bc3b5c3a2f513ecb612195aa7154975.1582702693.git.riteshh@linux.ibm.com>
On Wed 26-02-20 15:27:03, Ritesh Harjani wrote:
> IOMAP_F_MERGED needs to be set in case of non-extent based mapping.
> This is needed in later patches for conversion of ext4_fiemap to use iomap.
>
> Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
> ---
> fs/ext4/inode.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index d035acab5b2a..3b4230cf0bc2 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3335,6 +3335,10 @@ static void ext4_set_iomap(struct inode *inode, struct iomap *iomap,
> iomap->offset = (u64) map->m_lblk << blkbits;
> iomap->length = (u64) map->m_len << blkbits;
>
> + if ((map->m_flags & (EXT4_MAP_UNWRITTEN | EXT4_MAP_MAPPED)) &&
> + !ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
^^ we indent the second line of condition either like:
if ((map->m_flags & (EXT4_MAP_UNWRITTEN | EXT4_MAP_MAPPED)) &&
!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
or like:
if ((map->m_flags & (EXT4_MAP_UNWRITTEN | EXT4_MAP_MAPPED)) &&
!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
But on at the same level as following code block because that's highly
confusing at times...
Also EXT4_MAP_UNWRITTEN is never set for indirect block mapped files (that
on disk format does not support unwritten extents).
Honza
> + iomap->flags |= IOMAP_F_MERGED;
> +
> /*
> * Flags passed to ext4_map_blocks() for direct I/O writes can result
> * in m_flags having both EXT4_MAP_MAPPED and EXT4_MAP_UNWRITTEN bits
> --
> 2.21.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2020-02-26 12:27 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1582702693.git.riteshh@linux.ibm.com>
2020-02-26 9:57 ` [PATCHv3 1/6] ext4: Add IOMAP_F_MERGED for non-extent based mapping Ritesh Harjani
2020-02-26 12:26 ` Jan Kara [this message]
2020-02-26 12:33 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 2/6] ext4: Optimize ext4_ext_precache for 0 depth Ritesh Harjani
2020-02-26 12:28 ` Jan Kara
2020-02-26 9:57 ` [PATCHv3 3/6] ext4: Move ext4 bmap to use iomap infrastructure Ritesh Harjani
2020-02-26 12:29 ` Jan Kara
2020-02-26 9:57 ` [PATCHv3 4/6] ext4: Make ext4_ind_map_blocks work with fiemap Ritesh Harjani
2020-02-26 12:39 ` Jan Kara
2020-02-26 12:47 ` Ritesh Harjani
2020-02-26 16:11 ` Darrick J. Wong
2020-02-27 5:27 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 5/6] ext4: Move ext4_fiemap to use iomap framework Ritesh Harjani
2020-02-26 13:27 ` Jan Kara
2020-02-27 5:38 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 6/6] Documentation: Correct the description of FIEMAP_EXTENT_LAST Ritesh Harjani
2020-02-26 13:05 ` Matthew Wilcox
2020-02-26 16:17 ` Darrick J. Wong
2020-02-26 17:26 ` Jan Kara
2020-02-27 3:24 ` Dave Chinner
2020-02-27 5:17 ` Ritesh Harjani
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